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Chevy/GMC Duramax 01-04 LB7 Discussion of Chevy and GMC Trucks with LB7 Duramax Turbo Diesel Engines

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Just bought this truck. Has 150k miles. 5 speed auto allison tranny. Every single time the trans hits 5th gear, it vibrates. Like out of balance driveline annoying drone vibration. If its in 5th gear at highway speed, its vibrating. All the way passed 65-70 ... JOIN NOW TO REMOVE TRACER

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  #1  
Old 02-04-2013, 04:00 AM
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Default Duramax LB7 5th gear vibration. Help!!!!

Just bought this truck. Has 150k miles. 5 speed auto allison tranny. Every single time the trans hits 5th gear, it vibrates. Like out of balance driveline annoying drone vibration. If its in 5th gear at highway speed, its vibrating. All the way passed 65-70 mph. And the driveshaft, carrier, and u joints are all new. Trans shifts excellent, never slips, just vibs in 5th. Please help.
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  #2  
Old 03-01-2013, 10:19 PM
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Have you balanced your tires may have a bad tire just a suggestion
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Old 03-03-2013, 09:07 PM
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Is it just fifth gear or is it more the speed that makes it do it?

Hotforteacher's Sig:2002 Crew Cab Short bed 4x4 LB7. Air box mod. Air horn mod. EFI live with DP5. 4" MBRP no muffler with 5" tip. Glow shift EGT and Boost guages. Leveling kit. 285's. Just a low budget build to tow my trailers and have some fun at the same time.
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Old 04-15-2013, 06:09 PM
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its JUST 5th
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